<template>
  <div class="cart-box">
    <s-header :name="'购物车'"></s-header>
    <div class="cart-body">
      <van-checkbox-group @change="groupChange" v-model="result" ref="checkboxGroup">
        <van-swipe-cell :right-width="50" v-for="(item, index) in list" :key="index">
          <div class="good-item">
            <van-checkbox :name="item.cartItemId"/>
            <div class="good-img"><img :src="prefix(item.goodsCoverImg)" alt=""></div>
            <div class="good-desc">
              <div class="good-title">
                <span>{{ item.goodsName }}</span>
                <span>x{{ item.goodsCount }}</span>
              </div>
              <div class="good-btn">
                <div class="price">¥{{ item.sellingPrice }}</div>
                <van-stepper
                    integer
                    :min="1"
                    :value="item.goodsCount"
                    :name="item.cartItemId"
                    async-change
                    @change="onChange"
                />
              </div>
            </div>
          </div>
          <van-button
              slot="right"
              square
              icon="delete"
              type="danger"
              class="delete-button"
              @click="deleteGood(item.cartItemId)"
          />
        </van-swipe-cell>
      </van-checkbox-group>
    </div>
    <van-submit-bar
        v-if="list.length > 0"
        class="submit-all"
        :price="total * 100"
        button-text="结算"
        @submit="onSubmit"
    >
      <van-checkbox @click="allCheck" v-model="checkAll">全选</van-checkbox>
    </van-submit-bar>
    <div class="empty" v-if="!list.length">
      <van-icon name="smile-o"/>
      <div class="title">购物车空空空如也</div>
      <van-button color="#1baeae" type="primary" @click="goTo" block>前往首页</van-button>
    </div>
  </div>
</template>

<script>
import {Toast} from 'vant'
import sHeader from '@/components/SimpleHeader'
import {getCart, deleteCartItem,modifyCart} from '../service/cart'

export default {
  name: 'Cart',
  components: {
    sHeader
  },
  data() {
    return {
      list: [],
      result: [],
      checkAll: true
    }
  },
  mounted() {
    this.init()
  },
  computed: {
    total: function () {
      let sum = 0
      let _list = this.list.filter(item => this.result.includes(item.cartItemId))
      _list.forEach(item => {
        sum += item.goodsCount * item.sellingPrice
      })
      return sum
    }
  },
  methods: {
    async init() {
      Toast.loading({message: '加载中...', forbidClick: true});
      const {data} = await getCart({pageNumber: 1})
      this.list = data
      this.result = data.map(item => item.cartItemId)
      Toast.clear()
    },
    async deleteGood(id) {
      const {data} = await deleteCartItem(id)
      this.$store.dispatch('updateCart')
      this.init()
    },
    async onChange(value, detail) {
      if (this.list.filter(item => item.cartItemId == detail.name)[0].goodsCount == value) return
      Toast.loading({message: '修改中...', forbidClick: true});
      const params = {
        cartItemId: detail.name,
        goodsCount: value
      }
      const {data} = await modifyCart(params)
      this.list.forEach(item => {
        if (item.cartItemId == detail.name) {
          item.goodsCount = value
        }
      })
      Toast.clear();
    },
    groupChange(result) {
      if (result.length == this.list.length) {
        this.checkAll = true
      } else {
        this.checkAll = false
      }
      this.result = result
    },
    async onSubmit() {
      const params = JSON.stringify(this.result)

      this.$router.push({path: `create-order?cartItemIds=${params}`})
    },
    allCheck(value) {
      console.log('this.checkAll', this.checkAll)
      if (this.checkAll) {
        this.result = this.list.map(item => item.cartItemId)
      } else {
        this.result = []
      }
    },
    goTo(){
      this.$router.push('/home')
    }
  }
}
</script>

<style lang="less" scoped>
@import '../common/style/mixin';

.cart-box {
  .cart-body {
    margin: 60px 0 100px 0;
    padding-left: 10px;

    .good-item {
      display: flex;

      .good-img {
        img {
          .wh(100px, 100px)
        }
      }

      .good-desc {
        display: flex;
        flex-direction: column;
        justify-content: space-between;
        flex: 1;
        padding: 20px;

        .good-title {
          display: flex;
          justify-content: space-between;
        }

        .good-btn {
          display: flex;
          justify-content: space-between;

          .price {
            font-size: 16px;
            color: red;
            line-height: 28px;
          }

          .van-icon-delete {
            font-size: 20px;
            margin-top: 4px;
          }
        }
      }
    }

    .delete-button {
      width: 50px;
      height: 100%;
    }
  }

  .empty {
    width: 50%;
    margin: 0 auto;
    text-align: center;
    margin-top: 200px;

    .van-icon-smile-o {
      font-size: 50px;
    }

    .title {
      font-size: 16px;
      margin-bottom: 20px;
    }
  }

  .submit-all {
    margin-bottom: 50px;

    .van-checkbox {
      margin-left: 10px
    }

    .van-submit-bar__text {
      margin-right: 10px
    }

    .van-submit-bar__button {
      background: @primary;
    }
  }
}
</style>

<style lang="less">
@import '../common/style/mixin';

.van-checkbox__icon--checked .van-icon {
  background-color: @primary;
  border-color: @primary;
}
</style>